@misc{SchmeisserIrmscherWagner, author = {Schmeißer, Dieter and Irmscher, Klaus and Wagner, Gerd}, title = {Photoelectron spectra of Al dopants in 4H-SiC}, series = {Materials Science \& Engineering B}, volume = {102}, journal = {Materials Science \& Engineering B}, number = {1-3}, issn = {0921-5107}, pages = {284 -- 288}, abstract = {Al-doped 4H-SiC epitaxial layers were grown in a hot-wall chemical vapor deposition (CVD) system on commercial 4H-SiC substrates (CREE). The incorporation of Aluminum has been studied in the concentration range from 2*1014cm-3 up to 3*1020cm-3. Epitaxial layers with doping concentration NA-ND> 1019cm-3 were studied by HV-TEM and synchrotron radiation investigations. In the concentration range from 1*1019cm-3 to 3*1020 cm-3, measured by SIMS and Hall investigations, no Aluminum precipitation were detected in the grown layers. For SiC samples with an Al concentration of 1020cm-3 we have been able to detect the Al2p photoemission signal. The Al2p signal is recorded through the oxide layer (thickness of about 0.4nm), it has a main contribution at a binding energy of 73eV which corresponds to the energy typical for elemental Al0. In spectra excited with higher photon energies the sampled photoelectrons originate from deeper layers. In these data we notice an additional shoulder in the Al2p signal at around 71eV. The evidence of two contributions is attributed to the fact that Al is incorporated at different lattice sites. As the latter data represent more bulk like properties we argue that Al in the bulk SiC occupies both, substitutional lattice sites and interstitial sites while in the surface near regions Al is found only at substitutional lattice sites.}, language = {en} } @misc{AnalytiAntoniouDamasioetal., author = {Analyti, Anastasia and Antoniou, Grigoris and Damasio, Carlos Viegas and Wagner, Gerd}, title = {Negation and Negative Information in the W3C Resource Description Framework}, series = {Annals of Mathematics, Computing \& Teleinformatics}, volume = {1}, journal = {Annals of Mathematics, Computing \& Teleinformatics}, number = {2}, pages = {25 -- 34}, language = {en} } @misc{GuizzardiWagnerAroyo, author = {Guizzardi, Renata and Wagner, Gerd and Aroyo, Lora}, title = {Knowledge management in learning communities}, series = {The ICFAI Journal of Knowledge Management}, volume = {3}, journal = {The ICFAI Journal of Knowledge Management}, number = {3}, pages = {30 -- 46}, language = {en} } @misc{GasevicTaveterWagner, author = {Gasevic, Dragan and Taveter, Kuldar and Wagner, Gerd}, title = {Vocabularies, ontologies and rules for enterprise and business process modeling and management}, series = {Information Systems}, volume = {35}, journal = {Information Systems}, number = {4}, issn = {0306-4379}, pages = {375 -- 378}, language = {en} } @misc{MilanovicGasevicGiurcaetal., author = {Milanovic, Milan and Gasevic, Dragan and Giurca, Adrian and Wagner, Gerd and Lukichev, Sergey and Devedzic, Vladan}, title = {Model Transformations to Bridge Concrete and Abstract Syntax of Web Rule Languages}, language = {en} } @misc{AnalytiAntoniouViegasetal., author = {Analyti, Anastasia and Antoniou, Grigoris and Viegas, Carlos and Wagner, Gerd}, title = {Extended RDF as a Semantic Foundation of Rule Markup Languages}, language = {en} } @misc{Wagner, author = {Wagner, Gerd}, title = {The Agent-Object-Relationship Meta-Model: Towards a Unified View of State and Behavior}, series = {Information Systems}, volume = {28}, journal = {Information Systems}, number = {5}, issn = {0306-4379}, pages = {475 -- 504}, language = {en} } @misc{Wagner, author = {Wagner, Gerd}, title = {Seven Golden Rules for a Web Rule Language}, volume = {18}, number = {5}, pages = {82 -- 83}, language = {en} } @misc{KavianiGasevicHatalaetal., author = {Kaviani, Nima and Gasevic, Dragan and Hatala, Marek and Clement, David and Wagner, Gerd}, title = {Integration of Rules and Policies for Semantic Web Services}, language = {en} } @misc{GiurcaWagnerDevedzicetal., author = {Giurca, Adrian and Wagner, Gerd and Devedzic, Vladan and Milanovic, Milan and Gasevic, Dragan}, title = {Towards Sharing Rules between OWL/SWRL and UML/OCL}, series = {Electronic Communications of the EASST}, journal = {Electronic Communications of the EASST}, number = {5}, issn = {1863-2122}, language = {en} } @misc{WagnerDamasioAntoniou, author = {Wagner, Gerd and Damasio, Carlos Viegas and Antoniou, Grigoris}, title = {Towards a General Web Rule Language}, language = {en} } @misc{MilanovicGasevicGurcaetal., author = {Milanovic, Milan and Gasevic, Dragan and Gurca, Adrian and Wagner, Gerd and Devedzic, Vladan}, title = {Sharin OCL Constraints by Using Web Rules}, language = {en} } @misc{NicolaeGiurcaWagner, author = {Nicolae, Oana and Giurca, Adrian and Wagner, Gerd}, title = {On Interchange between JBossRules and Jess}, series = {Informatica : an international journal of computing and informatics}, volume = {3}, journal = {Informatica : an international journal of computing and informatics}, number = {4}, issn = {0350-5596}, pages = {383 -- 396}, language = {en} } @misc{SchwarzkopfDirsyteDevietal., author = {Schwarzkopf, Jutta and Dirsyte, R. and Devi, A. and Kwasniewski, A. and Schmidbauer, M. and Wagner, Gerd and Michling, Marcel and Schmeißer, Dieter and Fornari, Robert}, title = {Influence of Na on the structure of Bi4Ti3O12 films deposited by liquid-delivery spin MOCVD}, series = {Thin solid films}, volume = {519}, journal = {Thin solid films}, number = {17}, issn = {0040-6090}, pages = {5754 -- 5759}, language = {en} } @misc{MilanovicGasevicGiurcaetal., author = {Milanovic, Milan and Gasevic, Dragan and Giurca, Adrian and Wagner, Gerd and Devedzic, Vladan}, title = {Bridging Concrete and Abstract Syntax in Model Driven Engineering: A Case of Rule Languages}, language = {en} } @misc{GuizzardiWagnerAlmeidaetal., author = {Guizzardi, Giancarlo and Wagner, Gerd and Almeida, Jo{\~a}o Paulo Andrade and Guizzardi, Renata}, title = {Towards Ontological Foundation for Conceptual Modeling: The Unified Foundationa lOntology (UFO) Story}, series = {Applied Ontology}, volume = {10}, journal = {Applied Ontology}, number = {3-4}, issn = {1570-5838}, doi = {10.3233/AO-150157}, pages = {259 -- 271}, language = {en} } @misc{Wagner, author = {Wagner, Gerd}, title = {Information and Process Modeling for Simulation - Part I.}, series = {Journal of Simulation Engineering}, volume = {1}, journal = {Journal of Simulation Engineering}, issn = {2569-9466}, pages = {25}, abstract = {In simulation engineering, a system model mainly consists of an information model describing a system's state structure and a process model describing its dynamics. In the fields of Information Systems and Software Engineering, there are widely used standards such as the Class Diagrams of the Unified Modeling Language (UML) for making information models, and the Business Process Modeling Notation (BPMN) for making process models. This tutorial presents a general Object Event Modeling (OEM) approach for Discrete Event Simulation modeling using UML class diagrams and BPMN-based process diagrams at all three levels of model-driven simulation engineering: for making conceptual domain models, for making platform-independent simulation design models, and for making platform-specific, executable simulation models. In this approach, object and event types are modeled as special categories of UML classes, random variables are modeled as a special category of UML operations constrained to comply with a specific probability distribution, and queues are modeled as ordered association ends, while event rules are modeled both as BPMN-based process diagrams and pseudo-code. In Part II, we will discuss the more advanced OEM concepts of activities and GPSS/SIMAN/Arena-style Processing Networks. Finally, in Part III, we will further extend the OEM paradigm towards agent-based modeling and simulation by adding the concepts of agents with perceptions, actions and beliefs.}, language = {en} } @misc{WagnerDrogoulFishwicketal., author = {Wagner, Gerd and Drogoul, Alexis and Fishwick, Paul and Gilbert, Nigel and Pegden, Dennis and Yilmaz, Levent}, title = {Panel Discussion: On the Unity and Diversity of Computer Simulation}, series = {Journal of Simulation Engineering}, volume = {1}, journal = {Journal of Simulation Engineering}, issn = {2569-9466}, pages = {9}, abstract = {The term Computer Simulation subsumes different simulation paradigms, languages and implementation technologies as well as many different application areas each with its own scientific communities. So, there is clearly a lot of conceptual, methodological, technological and application diversity in the area of Computer Simulation. From its start in 1967, the Winter Simulation Conference managed to get four scientific communities involved: computer scientists, electrical engineers, industrial engineers and mathematicians (operations researchers). Only later, in 2011 and 2012, an attempt was made to get environmental and social scientists involved who have been adopting the idea of "individual-based" or "agent-based" simulation. Today, two American, a European and an Asian social simulation conference have been established. How much unity exists between the scientific areas and communities represented by the Winter Simulation Conference? How much unity exists between the scientific areas and communities represented by the newer social science simulation conferences? And how much unity exists between Discrete Event Simulation and the newer forms of social science simulation? These and other questions about the unity and diversity of Computer Simulation have been discussed via email from April 17 to May 17, 2018, by five leading experts: Alexis Drogoul, Paul Fishwick, Nigel Gilbert, Dennis Pegden and Levent Yilmaz, moderated by Gerd Wagner.}, language = {en} }